转移.net core 3.1，为.NET 5做准备

OpenAuth.Mvc/Models/JsonBinderProvider.cs

@@ -0,0 +1,26 @@
+using System;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Binders;
+using Newtonsoft.Json.Linq;
+using OpenAuth.Mvc.Models;
+
+namespace OpenAuth.Mvc
+{
+    public class JsonBinderProvider : IModelBinderProvider
+    {
+        public IModelBinder GetBinder(ModelBinderProviderContext context)
+        {
+            if(context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (context.Metadata.ModelType == typeof(JObject))
+            {
+                return new BinderTypeModelBinder(typeof(JobjectModelBinder));
+            }
+
+            return null;
+        }
+    }
+}